There is a set of ground elements e = {e1, e2, . . , en} and a collection of m subsets s1, s2, . . , sm of the ground elements (that is, si ⊆ e for 1 ≤ i ≤ m).the goal is to select a minimum cardinality set a of ground elements such that a contains at least one element from each subset si. give a polynomial time algorithm for this problem or state the decision version of this problem and prove that it is np-complete.

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answer; ///pegged exchange rate with the united states;

answer: in the short-run firms will respond by raising the price of turkey.

explanation: initially the long-run equilibrium is at a price of $5 per pound of turkey and a quantity of 50 million pounds per year. now, when webmd claims that a protein found in turkey will increase your expected lifespan by 4 years. the consumers demand for turkey will increase at every price shifting the demand curve to the right from d1 to d2. while, there will be no change in the supply curve in the short-run as it is not possible for producers to adjust supply so quickly. as a result the new equilibrium will occur at a higher price and a higher quantity of turkey.

thus, in the short run firms will respond by increasing the price of turkey, selling more quantity at a higher price and earning economic profits.